Cheapest priced copy (Shards of Alara): $0.35 at Card Kingdom, near mint, their price list as of .
Mosstodon 
Creature — Plant Elephant · 5/3 · Common · Shards of Alara · #139
{1}: Target creature with power 5 or greater gains trample until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shards of Alara | 139 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 October 2008The ability checks the targeted creature’s power twice: when the creature becomes the target, and when the ability resolves. Once the ability resolves, it will continue to apply to the affected creature no matter what its power may become later in the turn.